Flow regulator



FIG. 1 is a top-front perspective view of a flow regulator in accordance with our design;

FIG. 2 is a bottom-rear perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a side elevational view thereof, with the opposite side being identical.

The broken lines illustrated form no part of the claimed design. 

The ornamental design for a flow regulator, as shown and described. 